Online measurement of particle size of high concentration slurry two-phase flows based on ultrasound method
In recent years,particle size measurement has been widely studied at home and abroad,and the online measurement of high concentration two-phase flow of slurry has become the focus of attention.In order to measure the particle size distribution of limestone slurry during flow,ultrasonic attenuation spectra of slurry with mass concentrations of 10%—40%at different moments were obtained by an ultrasonic online measuring device.A weighted non-negative least squares algorithm(ORT-WTLS)based on optimal regularization was used to calculate the slurry particle size distribution based on the predicted theoretical spectra of Harker&Temple and BLBL scattering models.The results showed that the relative deviations of the particle diameters calculated from the theoretical attenuation spectra and the 10dB noise-containing attenuation spectra of different particle sizes were less than 5%.The attenuation coefficients did not increase linearly with slurry concentration,indicating that the Harker&Temple and BLBL nonlinear models were suitable for the theoretical prediction of high concentration slurry systems.The ORT-WTLS algorithm was used to weight the measurement errors in the slurry experimental attenuation spectrum and calculate the particle size distribution,and the measurement results were basically consistent with the image method,and the dynamic measurement deviation was less than 7%.Therefore,combining the experimental ultrasonic attenuation spectrum,the nonlinear acoustic theoretical model of particle measurement,and the ORT-WTLS inversion algorithm can accurately calculate the particle size distribution of highly concentrated slurry.
国家科技期刊平台
NSTL
万方数据
